Sure. Currently my curation rewards are 3.524 SP/week (2-1 weeks ago sample) https://steemit.com/@umich/curation-rewards. Back then (2 weeks ago) I had about 130 - 170 SP used for curation (Current number is different and subject to change due to SP leases starting and expiring). Hence on average I roughly got about 2 SP per week for every 100 SP I used. Or about 2% return per week. This is relatively high.
You can get rough estimates for other users by looking up their rewards and dividing them by their SP used for curation.